Active Silica Diagenesis in the Deepest Hadal Trench Sediments

Min Luo; Weiding Li; Sonja Geilert; Andrew W. Dale; Zijun Song; Duofu Chen

doi:10.1029/2022GL099365

Active Silica Diagenesis in the Deepest Hadal Trench Sediments

Min Luo^*
, Weiding Li
, Sonja Geilert
, Andrew W. Dale
, Zijun Song
, Duofu Chen

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Porewater dissolved silicic acid (DSi) concentrations and stable Si isotope compositions (δ³⁰Si) together with biogenic silica (bSiO₂) contents of sediments in five sediment cores collected from the southern Mariana Trench are presented. These data suggest the occurrence of bSiO₂ dissolution and concomitant authigenic clay formation in three bSiO₂-bearing cores. A reaction-transport model constrained by the measured geochemical data was applied to quantify the rates of Si turnover. Model results predicted the greatest rates of both bSiO₂ dissolution and authigenic clay formation at the trench axis core that displayed low bSiO₂ contents and abundant detrital materials, suggesting that detrital materials may be a limiting factor for bSiO₂ diagenesis. Model results further predicted that ∼40%–70% of DSi generated by bSiO₂ dissolution is consumed by authigenic clay formation. This is the first study that demonstrates active silica diagenesis in the hadal realm and has implications for understanding benthic Si cycling in deep-sea settings.

Original language	English
Article number	e2022GL099365
Number of pages	9
Journal	Geophysical Research Letters
Volume	49
Issue number	14
DOIs	https://doi.org/10.1029/2022GL099365
Publication status	Published - 28 Jul 2022
Externally published	Yes

Bibliographical note

Funding Information:
We thank the captain and crews of RV for their invaluable help with sampling at sea. This study was supported by National Natural Science Foundation of China (grants 42076057 and 42176069) and Shanghai Rising‐Star Program (21QA1403700). We thank Sarah Feakins (the Editor of GRL) for handling our submission and two anonymous reviewers for their constructive comments on the manuscript. Tansuoyihao

Funding Information:
We thank the captain and crews of RV Tansuoyihao for their invaluable help with sampling at sea. This study was supported by National Natural Science Foundation of China (grants 42076057 and 42176069) and Shanghai Rising-Star Program (21QA1403700). We thank Sarah Feakins (the Editor of GRL) for handling our submission and two anonymous reviewers for their constructive comments on the manuscript.

Publisher Copyright:
© 2022. American Geophysical Union. All Rights Reserved.

Funding

We thank the captain and crews of RV for their invaluable help with sampling at sea. This study was supported by National Natural Science Foundation of China (grants 42076057 and 42176069) and Shanghai Rising‐Star Program (21QA1403700). We thank Sarah Feakins (the Editor of GRL) for handling our submission and two anonymous reviewers for their constructive comments on the manuscript. Tansuoyihao We thank the captain and crews of RV Tansuoyihao for their invaluable help with sampling at sea. This study was supported by National Natural Science Foundation of China (grants 42076057 and 42176069) and Shanghai Rising-Star Program (21QA1403700). We thank Sarah Feakins (the Editor of GRL) for handling our submission and two anonymous reviewers for their constructive comments on the manuscript.

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10.1029/2022GL099365

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title = "Active Silica Diagenesis in the Deepest Hadal Trench Sediments",

abstract = "Porewater dissolved silicic acid (DSi) concentrations and stable Si isotope compositions (δ30Si) together with biogenic silica (bSiO2) contents of sediments in five sediment cores collected from the southern Mariana Trench are presented. These data suggest the occurrence of bSiO2 dissolution and concomitant authigenic clay formation in three bSiO2-bearing cores. A reaction-transport model constrained by the measured geochemical data was applied to quantify the rates of Si turnover. Model results predicted the greatest rates of both bSiO2 dissolution and authigenic clay formation at the trench axis core that displayed low bSiO2 contents and abundant detrital materials, suggesting that detrital materials may be a limiting factor for bSiO2 diagenesis. Model results further predicted that ∼40\%–70\% of DSi generated by bSiO2 dissolution is consumed by authigenic clay formation. This is the first study that demonstrates active silica diagenesis in the hadal realm and has implications for understanding benthic Si cycling in deep-sea settings.",

author = "Min Luo and Weiding Li and Sonja Geilert and Dale, \{Andrew W.\} and Zijun Song and Duofu Chen",

note = "Funding Information: We thank the captain and crews of RV for their invaluable help with sampling at sea. This study was supported by National Natural Science Foundation of China (grants 42076057 and 42176069) and Shanghai Rising‐Star Program (21QA1403700). We thank Sarah Feakins (the Editor of GRL) for handling our submission and two anonymous reviewers for their constructive comments on the manuscript. Tansuoyihao Funding Information: We thank the captain and crews of RV Tansuoyihao for their invaluable help with sampling at sea. This study was supported by National Natural Science Foundation of China (grants 42076057 and 42176069) and Shanghai Rising-Star Program (21QA1403700). We thank Sarah Feakins (the Editor of GRL) for handling our submission and two anonymous reviewers for their constructive comments on the manuscript. Publisher Copyright: {\textcopyright} 2022. American Geophysical Union. All Rights Reserved.",

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AU - Luo, Min

AU - Li, Weiding

AU - Geilert, Sonja

AU - Dale, Andrew W.

AU - Song, Zijun

AU - Chen, Duofu

N1 - Funding Information: We thank the captain and crews of RV for their invaluable help with sampling at sea. This study was supported by National Natural Science Foundation of China (grants 42076057 and 42176069) and Shanghai Rising‐Star Program (21QA1403700). We thank Sarah Feakins (the Editor of GRL) for handling our submission and two anonymous reviewers for their constructive comments on the manuscript. Tansuoyihao Funding Information: We thank the captain and crews of RV Tansuoyihao for their invaluable help with sampling at sea. This study was supported by National Natural Science Foundation of China (grants 42076057 and 42176069) and Shanghai Rising-Star Program (21QA1403700). We thank Sarah Feakins (the Editor of GRL) for handling our submission and two anonymous reviewers for their constructive comments on the manuscript. Publisher Copyright: © 2022. American Geophysical Union. All Rights Reserved.

PY - 2022/7/28

Y1 - 2022/7/28

N2 - Porewater dissolved silicic acid (DSi) concentrations and stable Si isotope compositions (δ30Si) together with biogenic silica (bSiO2) contents of sediments in five sediment cores collected from the southern Mariana Trench are presented. These data suggest the occurrence of bSiO2 dissolution and concomitant authigenic clay formation in three bSiO2-bearing cores. A reaction-transport model constrained by the measured geochemical data was applied to quantify the rates of Si turnover. Model results predicted the greatest rates of both bSiO2 dissolution and authigenic clay formation at the trench axis core that displayed low bSiO2 contents and abundant detrital materials, suggesting that detrital materials may be a limiting factor for bSiO2 diagenesis. Model results further predicted that ∼40%–70% of DSi generated by bSiO2 dissolution is consumed by authigenic clay formation. This is the first study that demonstrates active silica diagenesis in the hadal realm and has implications for understanding benthic Si cycling in deep-sea settings.

AB - Porewater dissolved silicic acid (DSi) concentrations and stable Si isotope compositions (δ30Si) together with biogenic silica (bSiO2) contents of sediments in five sediment cores collected from the southern Mariana Trench are presented. These data suggest the occurrence of bSiO2 dissolution and concomitant authigenic clay formation in three bSiO2-bearing cores. A reaction-transport model constrained by the measured geochemical data was applied to quantify the rates of Si turnover. Model results predicted the greatest rates of both bSiO2 dissolution and authigenic clay formation at the trench axis core that displayed low bSiO2 contents and abundant detrital materials, suggesting that detrital materials may be a limiting factor for bSiO2 diagenesis. Model results further predicted that ∼40%–70% of DSi generated by bSiO2 dissolution is consumed by authigenic clay formation. This is the first study that demonstrates active silica diagenesis in the hadal realm and has implications for understanding benthic Si cycling in deep-sea settings.

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DO - 10.1029/2022GL099365

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JF - Geophysical Research Letters

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M1 - e2022GL099365

ER -

Active Silica Diagenesis in the Deepest Hadal Trench Sediments

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